Epoxy Resin Hardners

Epoxy Resin Hardners

Epoxy resin hardeners (or curing agents) are reactive compounds that can react with epoxles at room temperature or higher temperatures. There are two main categories in curing agents: polyamides and aliphatic polyamines in the curing period, firstly primary hydrogens on the amines react with epoxy groups to make secondary amines. Then, secondary amines react with epoxy to cure Finally, the tertiary amines produced react with epoxy groups to get polymer networks. In order to produce cross-linked polymer networks three active hydrogens and two amine groups must be in the amine hardener chemical structures

There are many different types of amine hardeners. But in general aliphatic, aromatic and cycloaliphatic amines are used with epoxies. Aromatic hardeners react slowly with epoxies at room temperature due to the steric hindrance by aromatic rings. Therefore, the heat is necessary to initiate the curing period. The curing is achieved in higher temperatures Aromatic structure provides more chemical and heat resistance compared aliphatic amines

Auphatic amines are very useful for curing at room temperature. The hydrogens in aliphatic amines are very active so they release heat while reacting with epoxies. For this reason, the pot life is very short. The bonds between the aliphatic amines and eposies are very strong that offers more resistance to alkali and inorganic acids but the solvent resistance is not good Aliphatic amines are hazardous and irritates skin.

Cycloaliphatic polyamines are produced reacting epoxy with high amount of cyclealiphatic amines possessing any double bonds in their chemical structures. Due to this fact they provide excellent color and color stability, Because their molecular weights are high, they are less volatile, less toxic and have lower amine odour Aisa they are not exothermic.

Cycloaliphatic polyamines are produced reacting epoxy with high amount of cyclealiphatic amines possessing any double bonds in their chemical structures. Due to this fact they provide excellent color and color stability, Because their molecular weights are high, they are less volatile, less toxic and have lower amine odour Aisa they are not exothermic as the aliphatic amines They n be used as curing agents for casting, adhesives mortars and primers.

Cycloaliphatic polyamines are produced reacting epoxy with high amount of cyclealiphatic amines possessing any double bonds in their chemical structures. Due to this fact they provide excellent color and color stability, Because their molecular weights are high, they are less volatile, less toxic and have lower amine odour Aisa they are not exothermic as the aliphatic amines They n be used as curing agents for casting, adhesives mortars and primers.

Content of hardener for 100g of Epoxy Resin = AHEWx100/EEW

AHEW=Amine hydrogen equivalent weight of hardener

EEW=Equivalent weight of epoxy resin

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